Kabushiki Kaisha Imasen Denki Seisakusho

Nhk Spring Co., Ltd.

Akira Sakoguchi

Tsuyoshi Inoue

Akira Sasaki

Toshiaki Sone

Kiyoyuki Kojima

Hiroyuki Ueki

A seat apparatus includes a reclining device and a power assist mechanism coupled to the reclining device through a coupling rod. The power assist mechanism includes a motor; a seat back-side bracket which is tiltably provided to move the seat back; an operational gear which is turnable depending on a rotational direction of the motor; a rod gear provided integrally with the coupling rod; and a lever gear having a gear part capable of being engaged with the rod gear and an engaging part capable of being engaged with the operational gear. The lever gear transmits the turning of the operational gear to the rod gear.

Seat apparatus

The present invention presents a motor drive device capable of detecting jamming accurately without falsely detecting jamming when a movable part contacts with other members. Jamming by a backrest is detected by judging whether the value of a period of one pulse Pand a period of the next pulse P(P/P) integrated for 150 times (integrated value: 150) exceeds a specified threshold () or not. Accordingly, if the backrest rubs against a backrest of an adjacent seat, and the motor speed suddenly drops for a short period, such 'warp' is not falsely detected as jamming, and only actual jamming can be detected securely.

Motor drive device

Growing community of inventors

Inuyama, Japan

Akira Sakoguchi